Letrozole: I ovulated but didn’t get pregnant.

Ti

So because of PCOS, I don’t ovulate on my own. So I was put on Letrozole. I did one cycle of 2.5mg and ovulated and then my period came. I am day one of cycle 2 of Letrozole 2.5 mg. Is there something I should be asking my OB? I feel like it’s not enough to be like ok here are the meds, come for a blood test, and if you ovulate you’ll wait to take a pregnancy test. I know even if I ovulate it doesn’t always mean I’ll get pregnant. Maybe I need ultrasounds to check the size of my follicle? Has anyone got pregnant with another round of 2.5 mg of Letrozole?